Tower grillage



March 17, 1931. n G F. PORTER 1,796,720

TOWER GRLLAGE Filed Feb. 5, 1929 foef fi paiera-e,

,45 ture as a whole, the lower portion only being Patented Mar. 17, 1931 l i 'l UNITED STATES PATENT OFFICE GEORGE F. PORTER, F DETROIT, MICHIGA; DETROIT TRUST COMPANY, OF DETROIT, x

MICHIGAN, EXECUTOR OF SAID GEORGE F. PORTER," DEGEASED `'rowian GRILLAGE i Application led February 5, 1929. Serial 4No. .$37,667.

This invention relates to grillages or footstub-angles 3-are mounted in the grillage or ings for the legs of transmission towers or the footingsB.' :i y 1 `1 1` ,r I like, and more particularly to a novel means The `legs `2 are connected `to orin a rigid for attaching and supporting said legs in structure byfcross-bracing composed of later- 5 position on said grillage. als 4 and diagonals 5 in theusual manner 5:

Heretofore, the lower end of the tower legs `This invention `is directed to the footing have generally been flattened and inserted be or grillage .B for` thetower legs and `it will, tween two channel members as shown and detherefore, be understood that I do not `wish scribed in the Leeper Patent No. 1,180,592, `to be limited to anyparticulartower construcdated April 25, 1916. The construction ofthe tion;` i A Leeper patent is objectionable since there is an 0 The footings or grillagesto whichthe stubangle between the flattened end of the leg, angles for lower leg sections?) are secured are which is vertical, and the remainder of mounted insuitable `holeslin the groundiand the tower leg which is disposed at an angle. the holes may be filled with concrete or earth, Due to this angle between the flattened lower as desired The grillage nconsists of a plu- 65 end of the tower leg and the remainder of the rality of cross-ties or other suitable bearing leg, there is a tendency for the leg to push the members 7 arranged parallel with each other channels, between which its lower end is inin spaced relation, a pairof connectinglangle serted and secured, over sidewise so that they 'members 8 eatendin'g'at right angles fto lthe tend to revolve about their bases, and the le longitudinal axis of the ties 7 adjacent their 70 bends in the juncture between the lattene endsand ixedly secured thereto by rivets or portion and upper angle portion causing a bolts, and a pair of channel beams or other failure of the tower leg. shapes 9 are mounted intermediate the iends The present invention has for its object the of the `ties in `parallel spaced relation with provision of a novel mounting for the tower each other and at right angles to the longi- 75 legs which entirely eliminates the objections tudinal axis of the ties7. The beams 9 are noted above, is cheaper to make, and provides secured to the top faces of the ties 7 by bolts a materially stronger construction. "orrivets" 9a and are' spaced a su'icient elis- In the drawings: tanceto permit the mounting of the ends 'of 3o Figure 1 is an elevation showing the lower the stub-angles or lower towerj leg" sections S0 end of a transmission tower embodying my 3 between said beams. j i ll nl invention. j The-lower ends of; the'i tower legs, which Figure 2 is an enlarged fragmentary secare of angle sections, havethe outer portions tional plan showing the tower leg attachof their flanges or edges bent at an angle of ing means and taken 011 the lille II--II 0f 45 degrees, as at 10, so as to extend at right 35 Figure 3- angles to the vertical faces of the beams 9. Flgure 3 1S an enlarged fragmentary S1218 The bent portions 10 of the lower ends of elevation showing the tower leg mounted 1n the towel. legs are Connected by ,m angular the gluagacenter portion 12 which adds stiffness to the 40 Figure 4: is a plan of the grillage. Structure.

Collu hl rfl'gglentary elevatlon of one The lower ends of the tower legs are adapt- Referring iiore particularly to the drawltrcgisolhe glisrgolfytli lugs the letter A deslgnates the tower struc are secured to the inside vertical face of each ,95

' of the beams 9. The plates 14 are arranged well known construction and consists of leg 0n an angle equal ath the angular Posmm portions 2 of angle Sections, which legs are of the tower legs with their backs opposite provided with separate lower sections 3 each other and spaced a distance equal to the shown. The tower A is of an ordinary an termed stub-angles. The lower leg sections or thickness of the tower legs so as to permit the portions of the legs to fit snugly therebetween.

Suitable bolts or rivets are used to se-V cure the plates 14 to the beams 9 and to secure u the tower legs to the pates.

The present construction entirely eliminates the Weak spot located at the' flattened portion of the prior art structure and, therefore, the tower leg Will not kink or bend. The bent portionslO of the tower `leg are adapted to be bent l cold While the flattened ends of the prior art structure Were necessarily 'heated and forged, a much more expensive operation.

- 15 Vhe new structure permits the channels 9 tobe spaced fartherapart than the channels of the prior art structure, whereby the movement on the grillage beams is greatly reduced, andeither their size may be reduced With a consequent. saving in cost or they may be eX- tended a greater distance and more bearing 'area securedrfor they grillage.v v.While I have shown and described one specilic embodiment of my invention, it Will be understood that I do not Wish to be limited thereto, since various modications may be made Without departing from the scope of my invention. as defined in the appended claim. Y

39 I claim:k y

' The; combination of a footing having f spaced channel sections positioned With their backs opposite each other and extending verticallyj and a tovverleg which in vertical section isobli'que to said footing, said leg having vits Vends between said backs of said channels and having in 'cross-section an angular center bounded by edge portions which are in line VWith eachother and .at `right angles to the backs of said channels, and right, angle plates u secured to the backs ofsaid channels on-the opposite sides of said edge portionsofsaid .leg and in line With said leg for splicing said edge portions of the leg to said channels.

In .testimony whereof, I have hereunto set my hand.

1 GEORGE F. PORTER. 

